71M6515H-IGT/F Maxim Integrated Products, 71M6515H-IGT/F Datasheet - Page 39

• Manufacturer Part Number: 71M6515H-IGT/F
• Description: IC ENERGY METER AFE 3PH 64-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of 71M6515H-IGT/F

• Mounting Style: SMD/SMT
• Package / Case: LQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Page: 39 of 60
Since the signal at the input selected with F_SELECT is used to synchronize filters and other processing stages in the CE,
accuracy for most measurements will be reduced if no voltage is present at the selected phase input. Accuracy can be
established by selecting the phase that carries a stable signal (A, B, or C).
when using CTs and/or shunt resistor sensors or in Rogowski mode when using Rogowski coil sensors. In order to switch
the operation mode, the CE has to be disabled first by clearing the CE_EN bit.
PULSE_FAST determine the factor X in the equation used for Kh as shown in the table below.
PPMC2 registers.
Bits 20-19: These two bits (F_SELECT) select the phase that is to be used for frequency measurement. The frequency will
be shown in bits 31-16 of the FREQ_DELTA_T register (and as bit 4 of the STATUS word – in this form as a digitized zero
crossing signal).
Bit 21: This bit (CE_ONLY) disables the post-processor when set to 1. When the post-processor is disabled, the time-
intensive computations of IPHASE, IRMS, VAh and VRMS are not performed, and therefore smaller accumulation times
(SUM_CYCLES < 24) are permitted. In this case, the host is responsible for calculating IPHASE, IRMS, VAh and VRMS.
Bits 23-22: These two bits (IMAGE) select the code to be used by the CE. The CE can be operated in standard mode
Bit 24: This bit (RESET), when reset, forces all internal states of the 71M6515H to their power-up default.
Bits 26-25: These two bits (PULSE_SLOW, PULSE_FAST) modify the speed of the pulse generator. PULSE_SLOW and
PULSE_SLOW and PULSE_FAST will affect the operation of all four pulse outputs. See the Pulse Generation section for
details.
Bits 29-27: These three bits (IA_8X, IB_8X, IC_8X) apply an additional gain of 8 to the IA, IB, and IC channels when set to
1. This is a useful tool when very small signals are encountered, as is the case when using current shunt resistors with
very low resistance while operating at low currents. Care must be taken to avoid clipping. If the input to the meter exceeds
IMAX/8, clipping will occur. These bits should normally be zero, unless additional gain following the ADC stage is needed.
Bit 30: This bit (DEFAULT_PPM) defines the source of temperature compensation. When DEFAULT_PPM is 1, the
71M6515H will automatically apply compensation coefficients derived from the stored VREF temperature characteristics to
the PPMC and PPMC2 registers. When DEFAULT_PPM is zero, the host is allowed to write its own values to the PPMC and
A Maxim Integrated Products Brand
IMAGE 1
F_SELECT1
Bit 23
PULSE_SLOW
Bit 20
0
0
1
1
1 (default)
0
0
1
1
© 2005−2011 Teridian Semiconductor Corporation
0
0
1
IMAGE 0
Bit 22
F_SELECT0
0
1
0
1
Bit 19
0
1
0
1
PULSE_FAST
1 (default)
IMAGE
0
1
0
0
1
2
3
F_SELECT
0
1
2
3
CE Code Selected
Standard (CT/shunt)
Rogowski coil
Standard (CT/shunt)
Standard (CT/shunt)
1.5*2
1.5*2
1.5*2
-4
Phase
Selected
Phase A
Phase B
Phase C
Not allowed
= 0.09375
1.5
X
6
2
= 96
= 6
Energy Meter IC
DATA SHEET
71M6515H
JULY 2011
1.6